1 under /ˈʌndɚ/ preposition Learner's definition of UNDER
1
: in or to a lower place than (something) : below or beneath (something) : underneath在…下方；到…下面 -
They couldn't climb over the wall, so they dug a hole under it.他们无法翻越这道墙，因此就在墙下面挖了个洞。
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Draw a line under each word you don't know.在每个你不认识的单词下面画条线。
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We sat under a tree and rested a while.我们坐在树下歇了一会儿。
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I'm wearing a sweater under my jacket.我在夹克里面还穿了件毛衣。
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The ball rolled under the car.球滚到了那辆车底下。
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He had a mechanic check under the hood (of the car).他对汽车发动机罩下面的部分进行了一次机械检查。
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How long can you hold your breath under water?你在水中能憋气多长时间？
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There were 12 of us living under one roof. [=in one place]我们12个人同住一个屋檐下。
2
: guided or managed by (a person or group)在…指挥下；在…管理下 -
The cafe is under new management.这家咖啡厅归新的管理层管理。
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The army captured three forts while under the general's command.军队在这名将军的指挥下攻占了三个要塞。
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She has 12 employees (working) under her.她手下有12名员工。
3
: controlled or affected by (something)受…控制；受…影响 -
He has been under a lot of pressure/stress at work lately.他最近一直承受着巨大的工作压力。
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The roof collapsed under the weight of the snow. [=the weight of the snow on the roof caused it to collapse]这个屋顶在积雪的重压下坍塌了。
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The work was done under the direction/guidance/supervision of an architect. [=an architect directed/guided/supervised the work]这个工程是在建筑师的指挥/指导/监理下完成的。
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She was not under a doctor's care [=she did not have a doctor] at the time of the accident.事故发生时，她身边没有医生照料。
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Driving while under the influence of alcohol [=driving while drunk] is dangerous and illegal.醉酒驾车既危险又违法。
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You will be under anesthesia during the operation.动手术时你会被麻醉。
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I can't work under these conditions!在这种条件下我无法工作！
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I would never, under any circumstances, agree to do such a thing.在任何情况下，我都绝不会同意做这种事。
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The company was under no obligation [=was not obligated/required] to release the information.这家公司不承担发布此消息的义务。
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I was under the impression [=I thought] that admission was free.我还以为免费入场呢。
4
: in a particular state or condition : affected by a particular process在…情况下；在…条件下；在…进程中 -
The police put her under arrest. [=the police arrested her]警方逮捕了她。
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The house is under construction. [=is now being built]这房子正在建造。
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The incident is currently under investigation. [=is being investigated]此事件目前在调查中。
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His suggestion is still under discussion/consideration/review [=is still being discussed/considered/reviewed] by the committee.他的建议现在仍在委员会的讨论/考虑/审议当中。
5
: according to (something)按照；根据 -
Under the terms of the lease, rent will be due on the first of each month.按照租约，房租应在每月的第一天交纳。
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They have fulfilled all their obligations under the treaty.他们已按照协议履行了全部义务。
6
: within the group that has (a particular title or label)属于；列入；在…项之下 7
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used to say that a particular name is used to indicate something以，用（某名字） 8
: less or lower than (a certain age, amount of money, etc.)少于；低于 -
All the children in the class are under the age of 14.班上所有孩子都未满14岁。
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We arrived in under an hour.我们不到一小时就赶到了。
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You get all three items for under $10.你买的三件物品加起来还不到10美元。
9
: hidden below (an outward appearance)在…表面下 2 under /ˈʌndɚ/ adverb
Learner's definition of UNDER
1
a : in or into a position that is below or beneath something在下面；到下面 especially : in a position that is below the surface of water（尤指）在水下，到水下 b : in a forward direction that passes below something在下面穿过 2
: less than an expected or stated number or amount少于，低于（期望值或给出的数量） -
A score of 60 is needed to pass; anything under is failing.*60分及格，低于60分为不及格。
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Children aged five and under [=children who are five years old and younger] may enter the park for free.五岁及五岁以下的儿童进公园免费。
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Most of the restaurant's entrees are $10 or under. [=they cost $10 or less than $10]这家餐馆的大多数主菜价格是10美元或更低。
3
: into an unconscious state进入昏迷状态